JP6424030B2 - Cyclic olefin resin composition film - Google Patents

Description

  The present invention relates to a cyclic olefin resin composition film in which an elastomer or the like is added and dispersed in a cyclic olefin resin.

  Cyclic olefin resin is an amorphous and thermoplastic olefin resin that has a cyclic olefin skeleton in its main chain, has excellent optical properties (transparency, low birefringence), low water absorption, It has excellent performance such as dimensional stability and high moisture resistance. Therefore, films or sheets made of cyclic olefin resins are expected to be developed for various optical applications such as retardation films, polarizing plate protective films, light diffusion plates, and moisture proof packaging applications such as pharmaceutical packaging and food packaging. Yes.

  Since the film of a cyclic olefin resin is inferior in toughness, it is known to improve toughness by adding and dispersing an elastomer having a hard segment and a soft segment (see, for example, Patent Documents 1 to 4). .

  In the production of these films, the film is usually joined by cutting with an automatic cutter called splice at the time of roll switching. However, when the film cannot be easily cut, there is a possibility that the roll to be switched will entrain the film. Moreover, when a film is easy to break, runnability is lowered due to the unevenness of the splice part, and there is a possibility that the film breaks. Further, for workability and safety, a film that can be easily cut with a fingertip without using a jig such as scissors or a cutter is desired.

Japanese Patent Laid-Open No. 2004-156048 JP 2000-345122 A Japanese Patent Laid-Open No. 5-220836 JP-A-6-344436

  The present invention has been proposed in view of such conventional circumstances, and provides a cyclic olefin-based resin composition film having excellent workability.

  The present inventor added a styrene elastomer to the cyclic olefin resin, the average value of the short axis dispersion diameter of the styrene elastomer was not more than a predetermined value, and the cyclic olefin resin in the major axis direction and the minor axis direction of the styrene elastomer. It has been found that excellent workability can be obtained by defining the tear strength of the composition film, and the present invention has been completed.

  That is, according to the present invention, in the cyclic olefin resin composition film containing a cyclic olefin resin and a styrene elastomer, the average value of the short axis dispersion diameter of the styrene elastomer is 2.0 μm or less, The tear strength of the cyclic olefin resin composition film in the major axis direction of the styrene elastomer is 70 N / mm or less, and the tear strength of the cyclic olefin resin composition film in the minor axis direction of the styrene elastomer is 90 N / mm or more.

  The method for producing a cyclic olefin-based resin composition film according to the present invention includes a method of heating and melting a cyclic olefin-based resin and a styrene-based elastomer, and extruding the heat-melted cyclic olefin-based resin composition by an extrusion method. The average value of the short axis dispersion diameter of the styrene elastomer is 2.0 μm or less, and the tear strength of the cyclic olefin resin composition film in the major axis direction of the styrene elastomer is 70 N / mm. In the following, a cyclic olefin resin composition film having a tear strength of 90 N / mm or more in the short axis direction of the styrene elastomer is obtained.

  Moreover, the cyclic olefin resin composition film according to the present invention is suitable for application to transparent conductive elements, input devices, display devices, and electronic devices.

  According to the present invention, the average value of the short axis dispersion diameter of the styrenic elastomer is not more than a predetermined value, it is difficult to break in the MD direction, and has mechanical anisotropy that is easy to break in the TD direction. Can be obtained.

FIG. 1 is a cross-sectional perspective view showing an outline of a cyclic olefin-based resin composition film according to the present embodiment. FIG. 2 is a schematic diagram illustrating a configuration example of a film manufacturing apparatus. 3A and 3B are cross-sectional views illustrating an example of a transparent conductive film, and FIGS. 3C and 3D are cross-sectional views illustrating an example of a transparent conductive film provided with a moth-eye-shaped structure. FIG. 4 is a schematic cross-sectional view showing a configuration example of the touch panel. FIG. 5 is an external view illustrating an example of a television device as an electronic apparatus. 6A and 6B are external views illustrating examples of a digital camera as an electronic device. FIG. 7 is an external view illustrating an example of a notebook personal computer as an electronic device. FIG. 8 is an external view illustrating an example of a video camera as an electronic device. FIG. 9 is an external view illustrating an example of a mobile phone as an electronic device. FIG. 10 is an external view illustrating an example of a tablet computer as an electronic device.

Hereinafter, embodiments of the present invention will be described in detail in the following order with reference to the drawings.
1. 1. Cyclic olefin resin composition film 2. Production method of cyclic olefin-based resin composition film 3. Application example to electronic equipment Example

<1. Cyclic Olefin Resin Composition Film>
The cyclic olefin resin composition film according to the present embodiment contains a cyclic olefin resin and a styrene elastomer. The cyclic olefin resin composition film has an average value of the short axis dispersion diameter of the styrene elastomer of 2.0 μm or less, and the tear strength of the cyclic olefin resin composition film in the major axis direction of the styrene elastomer is 70 N / mm or less, and the tear strength of the cyclic olefin resin composition film in the minor axis direction of the styrene elastomer is 90 N / mm or more. Thereby, since it has the mechanical anisotropy which is hard to fracture | rupture in MD (Machine Direction) direction and is easy to fracture | rupture in TD (Transverse Direction) direction, the outstanding workability | operativity can be obtained.

  FIG. 1 is a cross-sectional perspective view showing an outline of a cyclic olefin-based resin composition film according to the present embodiment. As shown in FIG. 1, the cyclic olefin resin composition film contains a cyclic olefin resin 11 and a styrene elastomer 12.

  The cyclic olefin-based resin composition film is, for example, a short film or sheet, an X-axis direction that is a width direction (TD: Transverse Direction), and a Y-axis direction that is a length direction (MD: Machine Direction); And a Z-axis direction that is a thickness direction. The thickness Z of the cyclic olefin-based resin composition film is preferably 0.1 μm to 2 mm, more preferably 1 μm to 1 mm.

  As shown in FIG. 1, in the cyclic olefin resin composition film, a dispersed phase (island phase) made of styrene elastomer 12 is dispersed in a matrix (sea phase) made of cyclic olefin resin 11. The dispersed phase is dispersed with shape anisotropy in the MD direction by, for example, extrusion molding, has a major axis in the MD direction, and a minor axis in the TD direction.

  The short axis dispersion diameter of the styrene elastomer 12 is preferably 2.0 μm or less, more preferably 1.0 μm or less. If the minor axis dispersion diameter is too large, a gap is generated between the styrene elastomer / cyclic olefin resin due to the styrene elastomer phase change under environmental preservation, and the refractive index of the styrene elastomer itself changes, The haze of the entire film is greatly changed.

  In the present specification, the short axis dispersion diameter means the size in the TD direction of the dispersed phase composed of the styrene-based elastomer 12, and can be measured as follows. First, the TD-thickness (Z-axis) cross section of the cyclic olefin-based resin composition film is cut. Then, the cross section of the film is magnified, the short axis of each dispersed phase in the predetermined range at the center of the cross section of the film is measured, and the average value is defined as the short axis dispersion diameter. Moreover, when a dispersion diameter is small, it is preferable to cut | disconnect, after giving osmium dyeing | staining with respect to a film.

  The cyclic olefin resin composition has a tear strength in the major axis direction of the styrene elastomer of 70 N / mm or less and a tear strength in the minor axis direction of the styrene elastomer of 90 N / mm or more. That is, the tear strength in the MD direction that is pulled in the MD direction and is split in the TD direction is 70 N / mm or less, and the tear strength in the TD direction that is pulled in the TD direction and split in the MD direction is 90 N / mm or more. Thereby, since it has the mechanical anisotropy which is hard to fracture | rupture in MD direction and is easy to fracture | rupture in TD direction, the outstanding roll stable running property can be obtained. Moreover, since it becomes easy to cut | disconnect in a TD direction with a fingertip, without using jigs, such as scissors and a cutter, it is excellent in workability | operativity.

  The cyclic olefin resin composition film has a tear strength in the major axis direction of the styrene elastomer of 40 N / mm or more, and a tear strength in the major axis direction of the styrene elastomer and the minor axis direction of the styrene elastomer. The difference from the tear strength is preferably 40 N / mm or more. Thereby, excellent toughness can be obtained.

  Further, in the cyclic olefin resin composition film, the addition amount of the styrene elastomer is preferably less than 35 wt%, and preferably 5 wt% or more and 30 wt% or less. If the amount of styrene-based elastomer added is too large, retardation in the in-plane direction tends to increase, and if it is too small, sufficient toughness cannot be obtained.

  The cyclic olefin resin composition film preferably has an in-plane retardation of 30 nm or less. Thereby, for example, it can be applied as an indirect member in a liquid crystal display creation / evaluation process, for example, as an adhesive tape for reinforcement or a protective cover for a panel.

  Hereinafter, the cyclic olefin resin 11 and the styrene elastomer 12 will be described in detail.

[Cyclic olefin resin]
The cyclic olefin-based resin is a polymer compound having a main chain composed of carbon-carbon bonds and having a cyclic hydrocarbon structure in at least a part of the main chain. This cyclic hydrocarbon structure is introduced by using a compound (cyclic olefin) having at least one olefinic double bond in the cyclic hydrocarbon structure as represented by norbornene or tetracyclododecene as a monomer. Is done.

  Cyclic olefin resins include cyclic olefin addition (co) polymers or hydrogenated products thereof (1), cyclic olefin and α-olefin addition copolymers or hydrogenated products thereof (2), cyclic olefin ring-opening ( Co) polymers or hydrogenated products thereof (3).

  Specific examples of the cyclic olefin include: cyclopentene, cyclohexene, cyclooctene; one-ring cyclic olefin such as cyclopentadiene, 1,3-cyclohexadiene; bicyclo [2.2.1] hept-2-ene (common name: norbornene) ), 5-methyl-bicyclo [2.2.1] hept-2-ene, 5,5-dimethyl-bicyclo [2.2.1] hept-2-ene, 5-ethyl-bicyclo [2.2. 1] Hept-2-ene, 5-butyl-bicyclo [2.2.1] hept-2-ene, 5-ethylidene-bicyclo [2.2.1] hept-2-ene, 5-hexyl-bicyclo [ 2.2.1] hept-2-ene, 5-octyl-bicyclo [2.2.1] hept-2-ene, 5-octadecyl-bicyclo [2.2.1] hept-2-ene, 5- Methylidene Bicyclo [2.2.1] hept-2-ene, 5-vinyl-bicyclo [2.2.1] hept-2-ene, 5-propenyl-bicyclo [2.2.1] hept-2-ene, etc. A bicyclic olefin of

Tricyclo [4.3.0.1 ^2,5 ] deca-3,7-diene (common name: dicyclopentadiene), tricyclo [4.3.0.1 ^2,5 ] dec-3-ene; tricyclo [ 4.4.0.1 ^2,5 ] undeca-3,7-diene or tricyclo [4.4.0.1 ^2,5 ] undeca-3,8-diene or a partially hydrogenated product thereof (or cyclopentadiene) Tricyclo [4.4.0.1 ^2,5 ] undec-3-ene; 5-cyclopentyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexyl-bicyclo [2.2.1] hept-2-ene, 5-cyclohexenylbicyclo [2.2.1] hept-2-ene, 5-phenyl-bicyclo [2.2.1] hept-2-ene A cyclic olefin of the ring;

Tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene (also simply referred to as tetracyclododecene), 8-methyltetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-ethyltetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-methylidenetetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-ethylidenetetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-vinyltetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-propenyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] tetracyclic olefins such as dodec-3-ene;

8-cyclopentyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-cyclohexyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-cyclohexenyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene, 8-phenyl-cyclopentyl-tetracyclo [4.4.0.1 ^2,5 . 1 ^7,10 ] dodec-3-ene; tetracyclo [7.4.1 ^3,6 . 0 ^1,9 . 0 ^2,7 ] tetradeca-4,9,11,13-tetraene (also referred to as 1,4-methano-1,4,4a, 9a-tetrahydrofluorene), tetracyclo [8.4.1 ^4,7 . 0 ^1,10 . 0 ^3,8 ] pentadeca-5,10,12,14-tetraene (also called 1,4-methano-1,4,4a, 5,10,10a-hexahydroanthracene); pentacyclo [6.6.1]. ^.1,3,6 . 0 ^2,7 . 0 ^9,14 ] -4-hexadecene, pentacyclo [6.5.1.1 ^3,6 . 0 ^2,7 . 0 ^9,13] -4-pentadecene, pentacyclo [7.4.0.0 ^2,7. 1 ^3,6 . 1 ^10,13] -4-pentadecene; heptacyclo [8.7.0.1 ^2,9. 1 ^4,7 . 1 ^{11, 17} . 0 ^3,8 . 0 ^12,16 ] -5-eicosene, heptacyclo [8.7.0.1 ^2,9 . 0 ^3,8 . 1 ^4,7 . 0 ^12,17 . 1 ^13,16 ] ^-14-eicosene ; and polycyclic cyclic olefins such as a tetramer of cyclopentadiene. These cyclic olefins can be used alone or in combination of two or more.

  Specific examples of the α-olefin copolymerizable with the cyclic olefin include ethylene, propylene, 1-butene, 1-pentene, 1-hexene, 3-methyl-1-butene, 3-methyl-1-pentene, 3 -Ethyl-1-pentene, 4-methyl-1-pentene, 4-methyl-1-hexene, 4,4-dimethyl-1-hexene, 4,4-dimethyl-1-pentene, 4-ethyl-1- 2-20 carbon atoms such as hexene, 3-ethyl-1-hexene, 1-octene, 1-decene, 1-dodecene, 1-tetradecene, 1-hexadecene, 1-octadecene, 1-eicosene, preferably carbon number Examples include 2 to 8 ethylene or α-olefin. These α-olefins can be used alone or in combination of two or more. As these α-olefins, those contained in the range of 5 to 200 mol% with respect to the cyclic polyolefin can be used.

  There are no particular limitations on the polymerization method of the cyclic olefin or the cyclic olefin and the α-olefin and the hydrogenation method of the obtained polymer, and it can be carried out according to a known method.

  In the present embodiment, an addition copolymer of ethylene and norbornene is preferably used as the cyclic olefin-based resin.

  There is no restriction | limiting in particular in the structure of cyclic olefin resin, Although it may be chain | strand shape, a branched form, or bridge | crosslinking form, Preferably it is linear.

  The molecular weight of the cyclic olefin-based resin is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 15,000 to 100,000, as determined by the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.

  In addition, the cyclic olefin-based resin has polar groups (for example, a carboxyl group, an acid anhydride group, an epoxy group, an amide group, an ester group, a hydroxyl group, etc.) on the aforementioned cyclic olefin-based resins (l) to (3). What (4) which grafted and / or copolymerized the unsaturated compound (u) which has can be included. Two or more of the cyclic olefin resins (l) to (4) may be used in combination.

  Examples of the unsaturated compound (u) include (meth) acrylic acid, maleic acid, maleic anhydride, itaconic anhydride, glycidyl (meth) acrylate, alkyl (meth) acrylate (carbon number 1 to 10) ester, maleic acid Alkyl (C1-C10) ester, (meth) acrylamide, (meth) acrylic acid-2-hydroxyethyl, etc. are mentioned.

  Affinity with metals and polar resins can be increased by using a modified cyclic olefin resin (4) obtained by grafting and / or copolymerizing an unsaturated compound (u) having a polar group, so vapor deposition, sputtering, coating It is possible to increase the strength of various secondary processing such as adhesion, and is suitable when secondary processing is required. However, the presence of the polar group has a drawback of increasing the water absorption rate of the cyclic olefin resin. Therefore, the content of polar groups (for example, carboxyl group, acid anhydride group, epoxy group, amide group, ester group, hydroxyl group, etc.) is preferably 0 to 1 mol / kg per kg of cyclic olefin resin.

[Styrene elastomer]
The styrenic elastomer is a copolymer of styrene and a conjugated diene such as butadiene or isoprene, and / or a hydrogenated product thereof. The styrene elastomer is a block copolymer having styrene as a hard segment and conjugated diene as a soft segment. The structure of the soft segment changes the storage elastic modulus of the styrene-based elastomer, and the content of styrene that is the hard segment changes the refractive index and changes the haze of the entire film. The styrene elastomer does not require a vulcanization step and is preferably used. Further, the hydrogenated one is more preferable because it has higher thermal stability.

  Examples of styrenic elastomers include styrene / butadiene / styrene block copolymers, styrene / isoprene / styrene block copolymers, styrene / ethylene / butylene / styrene block copolymers, and styrene / ethylene / propylene / styrene block copolymers. Examples thereof include styrene and butadiene block copolymers.

  In addition, styrene / ethylene / butylene / styrene block copolymer, styrene / ethylene / propylene / styrene block copolymer, styrene / butadiene block copolymer (hydrogenation) in which double bond of conjugated diene component is eliminated by hydrogenation May also be used.

  The structure of the styrenic elastomer is not particularly limited, and may be chain-like, branched or cross-linked, but is preferably linear in order to reduce the storage elastic modulus.

  In the present embodiment, at least one styrene selected from the group consisting of styrene / ethylene / butylene / styrene block copolymers, styrene / ethylene / propylene / styrene block copolymers, and hydrogenated styrene / butadiene block copolymers. Based elastomers are preferably used. In particular, hydrogenated styrene / butadiene block copolymers are more preferably used because of high tear strength and small haze increase after environmental preservation. The ratio of butadiene to styrene in the hydrogenated styrene / butadiene block copolymer is preferably in the range of 10 to 90 mol% so as not to impair the compatibility with the cyclic olefin resin.

  Moreover, it is preferable that the styrene content rate of a styrene-type elastomer is 20-40 mol%. By setting the styrene content to 20 to 40 mol%, the haze can be reduced.

  The molecular weight of the styrene-based elastomer is 5,000 to 300,000, preferably 10,000 to 150,000, and more preferably 20,000 to 100,000, as determined by the GPC method. If the number average molecular weight is too low, the mechanical strength decreases, and if it is too high, the moldability deteriorates.

[Other additives]
In addition to the cyclic olefin-based resin and the styrene-based elastomer, various compounding agents may be added to the cyclic olefin-based resin composition as necessary as long as the characteristics are not impaired. The various compounding agents are not particularly limited as long as they are usually used in thermoplastic resin materials. For example, inorganic oxide fine particles, antioxidants, ultraviolet absorbers, light stabilizers, plasticizers, lubricants, Examples thereof include antistatic agents, flame retardants, colorants such as dyes and pigments, near infrared absorbers, compounding agents such as fluorescent whitening agents, and fillers.

  According to the cyclic olefin-based resin composition film having such a structure, since it has mechanical anisotropy that is difficult to break in the MD (Machine Direction) direction and is easy to break in the TD (Transverse Direction) direction, an excellent roll Stable running performance can be obtained. Moreover, since it becomes easy to cut | disconnect in a TD direction with a fingertip, without using jigs, such as scissors and a cutter, it is excellent in workability | operativity. Further, the retardation Re in the in-plane direction can be reduced to 30 nm or less by setting the addition amount of the styrene elastomer to 5 wt% or more and 30 wt% or less. When the retardation Re in the in-plane direction is larger than the above range, it becomes difficult to apply as a base material of a polarizing plate, for example.

<2. Method for Producing Cyclic Olefin Resin Composition Film>
The method for producing a cyclic olefin-based resin composition film according to the present embodiment is a method in which a cyclic olefin-based resin and a styrene-based elastomer are heated and melted. The average value of the short axis dispersion diameter of the styrene elastomer is 2.0 μm or less, and the tear strength of the cyclic olefin resin composition film in the major axis direction of the styrene elastomer is 70 N / mm or less, and A cyclic olefin resin composition film in which the tear strength of the cyclic olefin resin composition film in the minor axis direction of the styrene elastomer is 90 N / mm or more is obtained.

  The cyclic olefin-based resin composition film may be unstretched, uniaxially stretched, or biaxially stretched, but is preferably unstretched. In the case of normal uniaxial stretching, the tensile strength in the MD direction that is pulled in the MD direction and the tear in the TD direction is increased, the tear strength in the TD direction that is pulled in the TD direction and is split in the MD direction is decreased, and cutting in the TD direction becomes difficult. End up. In the case of uniaxial stretching of the tenter method, the tensile strength in the MD direction that is pulled in the MD direction and split in the TD direction is reduced, and the tensile strength in the TD direction that is pulled in the TD direction and is split in the MD direction is increased, but the structure of the apparatus is complicated. In addition, the cost is high, and furthermore, the stretching method generates a phase difference, so that it is difficult to obtain a desired low retardation film.

  FIG. 2 is a schematic diagram illustrating a configuration example of a film manufacturing apparatus. The film manufacturing apparatus includes a die 21 and a roll 22. The die 21 is a die for melt molding, and extrudes the molten resin material 23 into a film shape. The resin material 23 contains the above-mentioned cyclic olefin resin composition, for example. The roll 22 has a role of transporting the resin material 23 extruded from the die 21 into a film shape. Further, the roll 22 has a medium flow path therein, and the surface can be adjusted to an arbitrary temperature by an individual temperature control device. Moreover, the material of the surface of the roll 22 is not specifically limited, A metal rubber, resin, an elastomer, etc. can be used.

  In the present embodiment, as the resin material 23, a cyclic olefin-based resin composition containing the above-mentioned cyclic olefin-based resin and a styrene-based elastomer is used and melt-mixed at a temperature in the range of 210 ° C to 300 ° C. The higher the melting temperature, the smaller the short axis dispersion diameter of the styrene elastomer.

<3. Application example to electronic equipment>
The cyclic olefin-based resin composition film according to the present embodiment can be used for various optical applications, for example, a retardation film, a polarizing plate protective film, a light diffusion plate, etc., particularly a prism sheet and a liquid crystal cell substrate. Below, the application example which used the cyclic olefin resin composition film as a phase difference film is demonstrated.

  3A and 3B are cross-sectional views illustrating an example of a transparent conductive film. This transparent conductive film (transparent conductive element) is constituted by using the above-mentioned cyclic olefin-based resin composition film as a base film (base material). Specifically, this transparent conductive film includes a retardation film 31 as a base film (base material), and a transparent conductive layer 33 on at least one surface of the retardation film 31. FIG. 3A is an example in which the transparent conductive layer 33 is provided on one surface of the retardation film 31, and FIG. 3B is an example in which the transparent conductive layer 33 is provided on both surfaces of the retardation film 31. In addition, as shown in FIGS. 3A and 3B, a hard coat layer 32 may be further provided between the retardation film 31 and the transparent conductive layer 33.

  As a material of the transparent conductive layer 33, for example, one or more selected from the group consisting of electrically conductive metal oxide materials, metal materials, carbon materials, conductive polymers, and the like can be used. Examples of the metal oxide material include indium tin oxide (ITO) zinc oxide, indium oxide, antimony-added tin oxide, fluorine-added tin oxide, aluminum-added zinc oxide, gallium-added zinc oxide, silicon-added zinc oxide, and zinc oxide- Examples thereof include a tin oxide system, an indium oxide-tin oxide system, and a zinc oxide-indium oxide-magnesium oxide system. As the metal material, for example, metal nanofillers such as metal nanoparticles and metal nanowires can be used. Specific examples of these materials include copper, silver, gold, platinum, palladium, nickel, tin, cobalt, rhodium, iridium, iron, ruthenium, osmium, manganese, molybdenum, tungsten, niobium, tantalum, titanium, bismuth, Examples thereof include metals such as antimony and lead, and alloys thereof. Examples of the carbon material include carbon black, carbon fiber, fullerene, graphene, carbon nanotube, carbon microcoil, and nanohorn. As the conductive polymer, for example, substituted or unsubstituted polyaniline, polypyrrole, polythiofin, and one or two (co) polymers selected from these can be used.

  As a method for forming the transparent conductive layer 33, for example, a PVD method such as a sputtering method, a vacuum deposition method, or an ion plating method, a CVD method, a coating method, a printing method, or the like can be used. The transparent conductive layer 33 may be a transparent electrode having a predetermined electrode pattern. Examples of the electrode pattern include a stripe shape, but are not limited thereto.

  As a material of the hard coat layer 32, it is preferable to use an ionizing radiation curable resin that is cured by light or electron beam, or a thermosetting resin that is cured by heat, and a photosensitive resin that is cured by ultraviolet rays is most preferable. As such a photosensitive resin, for example, acrylate resins such as urethane acrylate, epoxy acrylate, polyester acrylate, polyol acrylate, polyether acrylate, and melamine acrylate can be used. For example, the urethane acrylate resin is obtained by reacting a polyester polyol with an isocyanate monomer or a prepolymer, and reacting an acrylate or methacrylate monomer having a hydroxyl group with the obtained product. The thickness of the hard coat layer 32 is preferably 1 μm to 20 μm, but is not particularly limited to this range.

  In addition, as shown in FIGS. 3C and 3D, the transparent conductive film is provided with a moth-eye structure 34 as an antireflection layer on at least one surface of the above-described retardation film. Also good. FIG. 3C is an example in which a moth-eye structure 34 is provided on one surface of the retardation film 31, and FIG. 3D is an example in which a moth-eye structure is provided on both surfaces of the retardation film. The antireflection layer provided on the surface of the retardation film 11 is not limited to the moth-eye structure described above, and a conventionally known antireflection layer such as a low refractive index layer can also be used. .

  FIG. 4 is a schematic cross-sectional view showing a configuration example of the touch panel. The touch panel (input device) 40 is a so-called resistive film type touch panel. The resistive film type touch panel may be either an analog resistive film type touch panel or a digital resistive film type touch panel.

  The touch panel 40 includes a first transparent conductive film 41 and a second transparent conductive film 42 facing the first transparent conductive film 41. The 1st transparent conductive film 41 and the 2nd transparent conductive film 42 are bonded together via the bonding part 45 between those peripheral parts. As the bonding part 45, for example, an adhesive paste, an adhesive tape or the like is used. The touch panel 40 is bonded to the display device 44 through the bonding layer 43, for example. As a material of the bonding layer 43, for example, an acrylic, rubber, or silicon adhesive can be used, and an acrylic adhesive is preferable from the viewpoint of transparency.

  The touch panel 40 further includes a polarizer 48 bonded to the surface on the touch side of the first transparent conductive film 41 via a bonding layer 50 or the like. As the 1st transparent conductive film 41 and / or the 2nd transparent conductive film 42, the above-mentioned transparent conductive film can be used. However, the retardation film as the base film (base material) is set to λ / 4. By adopting the polarizer 48 and the retardation film 31 in this way, the reflectance can be reduced and the visibility can be improved.

  In the touch panel 40, it is preferable to provide the moth-eye structure 34 on the opposing surfaces of the first transparent conductive film 41 and the second transparent conductive film 42, that is, on the surface of the transparent conductive layer 33. Thereby, the optical characteristics (for example, a reflection characteristic, a transmission characteristic, etc.) of the 1st transparent conductive film 41 and the 2nd transparent conductive film 42 can be improved.

  The touch panel 40 preferably further includes a single-layer or multi-layer antireflection layer on the surface of the first transparent conductive film 41 on the touch side. Thereby, a reflectance can be reduced and visibility can be improved.

  The touch panel 40 preferably further includes a hard coat layer on the surface of the first transparent conductive film 41 on the touch side from the viewpoint of improving the scratch resistance. The surface of the hard coat layer is preferably imparted with antifouling properties.

  The touch panel 40 preferably further includes a front panel (surface member) 49 that is bonded to the surface on the touch side of the first transparent conductive film 41 via the bonding layer 51. Moreover, it is preferable that the touch panel 40 further includes a glass substrate 46 bonded to the surface of the second transparent conductive film 42 bonded to the display device 44 via a bonding layer 47.

  The touch panel 40 preferably further includes a plurality of structures on the surface of the second transparent conductive film 42 that is bonded to the display device 44 or the like. The adhesion between the touch panel 40 and the bonding layer 43 can be improved by the anchor effect of the plurality of structures. As this structure, a moth-eye structure is preferable. Thereby, interface reflection can be suppressed.

  Examples of the display device 44 include a liquid crystal display, a CRT (Cathode Ray Tube) display, a plasma display panel (PDP), an electroluminescence (EL) display, and a surface conduction electron-emitting device display (Surface-conduction). Various display devices such as Electron-emitter Display (SED) can be used.

  Next, an electronic device including the input device 40 described above will be described. FIG. 5 is an external view illustrating an example of a television device as an electronic apparatus. The television device 100 includes a display unit 101, and the display unit 101 includes a touch panel 40.

  6A and 6B are external views illustrating examples of a digital camera as an electronic device. 6A is an external view of the digital camera viewed from the front side, and FIG. 6B is an external view of the digital camera viewed from the back side. The digital camera 110 includes a light emitting unit 111 for flash, a display unit 112, a menu switch 113, a shutter button 114, and the like, and the display unit 112 includes the touch panel 40 described above.

  FIG. 7 is an external view illustrating an example of a notebook personal computer as an electronic device. The notebook personal computer 120 includes a main body 121 including a keyboard 122 for inputting characters, a display unit 123 for displaying images, and the like, and the display unit 123 includes the touch panel 40 described above.

  FIG. 8 is an external view illustrating an example of a video camera as an electronic device. The video camera 130 includes a main body 131, a subject shooting lens 132 on the side facing forward, a start / stop switch 133 during shooting, a display unit 134, and the like, and the display unit 134 includes the touch panel 40 described above.

  FIG. 9 is an external view illustrating an example of a mobile phone as an electronic device. The mobile phone 140 is a so-called smartphone, and the display unit 141 includes the touch panel 40 described above.

  FIG. 10 is an external view illustrating an example of a tablet computer as an electronic device. The tablet computer 150 includes the touch panel 40 described above on the display unit 151.

  Even in each electronic device as described above, a cyclic olefin resin composition film with small in-plane retardation and excellent toughness is used for the display part, so that high durability and high image quality display is possible. Become.

<4. Example>
Examples of the present invention will be described in detail below. In this example, a styrene elastomer was added to a cyclic olefin resin, and a cyclic olefin resin composition film having a predetermined tear strength in the MD direction and the TD direction was prepared. The film retardation and workability were evaluated. The present invention is not limited to these examples.

  The short axis dispersion diameter, tear strength, retardation, and workability of the styrene-based elastomer of the cyclic olefin-based resin composition film were evaluated as follows.

[Measurement of short axis dispersion diameter]
The TD (Transverse Direction) -thickness (Z-axis) cross section of the cyclic olefin-based resin composition film was cut with a microtome, and the film cross section was magnified and observed about 2500 times with an optical microscope. And the short axis of the styrene-type elastomer of the range of 20 micrometers x 20 micrometers of the film cross section center was measured, and the average value was made into the short axis dispersion diameter of a surface layer part.

[Measurement of tear strength]
A film having a thickness of 80 μm was measured according to JISK7128. Using a No. 3 type test piece as a test piece, using a tensile tester (AG-X, manufactured by Shimadzu Corporation), measuring at a test speed of 200 mm / min, the average value of the tear strength in the MD direction pulled in the MD direction The average value of the tear strength in the TD direction that is pulled in the TD direction was calculated.

  The tear strength in the MD direction was evaluated as “◯” when the tear strength was 70 N / mm or less, and as “x” when the tear strength exceeded 70 N / mm. The tear strength in the TD direction was evaluated as “◯” when the tear strength was 100 N / mm or more, and “x” when less than 90 N / mm.

[Measurement of retardation]
An optical material inspection device (RETS-100, manufactured by Otsuka Electronics Co., Ltd.) was used to measure the in-plane retardation Re of the cyclic olefin resin composition film.

[Evaluation of workability]
Those having a tear strength in the MD direction of 70 N / mm or less and a tear strength in the TD direction of 90 N / mm or more were evaluated as “◯”, and the others were evaluated as “X”. If the tear strength in the MD direction is 70 N / mm or less and the tear strength in the TD direction is 90 N / mm or more, it can be easily cut by hand while maintaining the toughness, so that work efficiency is improved.

[Cyclic olefin resin and styrene elastomer]
The following three types of cyclic olefin resins were used.
TOPAS6013-S04 (manufactured by Polyplastics Co., Ltd.): addition copolymer of ethylene and norbornene ZEONOR ZF16 (manufactured by ZEON CORPORATION): cycloolefin polymer (COP) resin ZEONOR ZM16 (manufactured by Nippon Zeon Co., Ltd.): cyclo Olefin polymer (COP) resin

Moreover, the following 2 types were used as a styrene-type elastomer.
S. O. E. L606 (manufactured by Asahi Kasei Chemicals Corporation): hydrogenated styrene / butadiene block copolymer Tuftec H1517 (manufactured by Asahi Kasei Chemicals Corporation): styrene / ethylene / butylene / styrene block copolymer

[Example 1]
90% by weight of TOPAS 6013-S04 (manufactured by Polyplastics Co., Ltd.) as the cyclic olefin resin and S.E. O. E. L606 (manufactured by Asahi Kasei Chemicals Corporation) was blended at 10 wt%. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the short axis dispersion diameter of the styrene elastomer in the TD-thickness (Z axis) cross section of the film was 0.2 μm. Further, the tear strength in the MD direction was 53 N / mm, the tear strength in the TD direction was 165 N / mm, and the workability was evaluated as ○. Moreover, retardation Re was evaluation of (circle) in 4 nm.

[Example 2]
85 wt% of TOPAS6013-S04 (manufactured by Polyplastics Co., Ltd.) as a cyclic olefin resin and 15 wt% of Tuftec H1517 (manufactured by Asahi Kasei Chemicals Corporation) as a styrene elastomer were blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the short axis dispersion diameter of the styrene elastomer in the TD-thickness (Z axis) cross section of the film was 0.9 μm. The tear strength in the MD direction was 48 N / mm, and the tear strength in the TD direction was 145 N / mm. Moreover, retardation Re was evaluation of (circle) in 18 nm.

[Example 3]
As the cyclic olefin-based resin, 95% by weight of TOPAS6013-S04 (manufactured by Polyplastics Co., Ltd.) and 5% by weight of Tuftec H1517 (manufactured by Asahi Kasei Chemicals Corporation) as the styrene-based elastomer were blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the short axis dispersion diameter of the styrene elastomer in the TD-thickness (Z axis) cross section of the film was 0.6 μm. The tear strength in the MD direction was 46 N / mm, the tear strength in the TD direction was 105 N / mm, and the workability was evaluated as ○. Moreover, retardation Re was evaluation of (circle) in 9 nm.

[Example 4]
As the cyclic olefin resin, 70% by weight of TOPAS6013-S04 (manufactured by Polyplastics Co., Ltd.) and 30% by weight of Tuftec H1517 (manufactured by Asahi Kasei Chemicals Co., Ltd.) as styrene elastomers were blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the short-axis dispersion diameter of the styrene-based elastomer in the TD-thickness (Z-axis) cross section of the film was 1.8 μm. Further, the tear strength in the MD direction was 69 N / mm, the tear strength in the TD direction was 200 N / mm, and the workability was evaluated as ○. Moreover, retardation Re was evaluation of (circle) in 30 nm.

[Example 5]
96% by weight of TOPAS6013-S04 (manufactured by Polyplastics Co., Ltd.) as the cyclic olefin resin and 4% by weight of Tuftec H1517 (manufactured by Asahi Kasei Chemicals Corporation) as the styrene elastomer were blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the short-axis dispersion diameter of the styrene-based elastomer in the TD-thickness (Z-axis) cross section of the film was 0.5 μm. The tear strength in the MD direction was 43 N / mm, the tear strength in the TD direction was 90 N / mm, and the workability was evaluated as ○. Moreover, retardation Re was evaluation of (circle) in 3 nm.

[Comparative Example 1]
As the cyclic olefin resin, 65% by weight of TOPAS6013-S04 (manufactured by Polyplastics Co., Ltd.) and 35% by weight of Tuftec H1517 (manufactured by Asahi Kasei Chemicals Co., Ltd.) as styrene elastomers were blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the short-axis dispersion diameter of the styrene-based elastomer in the TD-thickness (Z-axis) cross section of the film was 1.9 μm. In addition, the tear strength in the MD direction was 72 N / mm, the tear strength in the TD direction was 220 N / mm, and the evaluation was o, and the workability was the evaluation of x. The retardation Re was evaluated as x at 32 nm.

[Comparative Example 2]
As the cyclic olefin resin, ZEONOR ZF16 (manufactured by Nippon Zeon Co., Ltd.) was used, and no styrene elastomer was blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the tear strength in the MD direction was x at 240 N / mm, the tear strength in the TD direction was 340 N / mm, and the evaluation was o, and the workability was an evaluation of x. Moreover, retardation Re was evaluation of (circle) in 5 nm.

[Comparative Example 3]
As a cyclic olefin resin, ZEONOR ZM16 (manufactured by Nippon Zeon Co., Ltd.) was used, and no styrene elastomer was blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the tear strength in the MD direction was 230 N / mm, x, the tear strength in the TD direction was 100 N / mm, and the evaluation was o, and the workability was evaluation of x. The retardation Re was evaluated as x at 138 nm.

[Comparative Example 4]
TOPAS6013-S04 (manufactured by Polyplastics Co., Ltd.) was used as the cyclic olefin resin, and no styrene elastomer was blended. This is kneaded at a predetermined temperature in the temperature range of 210 ° C. to 300 ° C. using a twin-screw extruder (specifications: diameter 25 mm, length: 26 D, T die width: 160 mm) with a T die attached to the tip, and then circular The olefin resin composition was extruded at a speed of 250 g / min, and a film having a thickness of 80 μm was wound on a roll.

  As shown in Table 1, the tear strength in the MD direction was 42 N / mm, the tear strength in the TD direction was 42 N / mm, and an evaluation of x, and the workability was an evaluation of x. Moreover, retardation Re was evaluation of (circle) in 3 nm.

  As in Comparative Examples 1 to 4, when the tear strength in the MD direction is 70 N / mm or less and the tear strength in the TD direction is not 90 N / mm or more, it is difficult to easily cut by hand while maintaining toughness. Met. Further, as in Comparative Example 1, when the addition amount of the styrene-based elastomer was large, the retardation Re in the in-plane direction was large. Moreover, when not adding a styrene-type elastomer like Comparative Examples 2-4, the tear strength of desired MD direction and TD direction was not obtained.

  On the other hand, as in Examples 1 to 5, when the tear strength in the MD direction is 70 N / mm or less and the tear strength in the TD direction is 90 N / mm or more, it is easily cut by hand while maintaining toughness. I was able to. Also, the mechanical anisotropy is excellent in workability because the tear strength in the MD direction is 40 N / mm or more and the difference between the tear strength in the MD direction and the tear strength in the TD direction is 40 N / mm or more. was gotten. Moreover, the retardation Re of 30 nm or less was obtained because the addition amount of the styrene-type elastomer is 5 wt% or more and 30 wt% or less.

11 Cyclic Olefin Resin, 12 Styrene Elastomer, 13 Inorganic Oxide Fine Particles, 21 Die, 22 Roll, 23 Resin Material, 31 Retardation Film, 32 Hard Coat Layer, 33 Transparent Conductive Layer, 34 Moth Eye Shape Structure, 40 Touch panel, 41 1st transparent conductive film, 42 2nd transparent conductive film, 43 bonding layer, 44 display device, 45 bonding part, 46 glass substrate, 47 bonding layer, 48 polarizer, 49 front panel , 50 bonding layer, 51 bonding layer, 100 TV apparatus, 101 display unit, 110 digital camera, 111 light emitting unit, 112 display unit, 113 menu switch, 114 shutter button, 120 notebook personal computer, 121 main body unit, 122 Keyboard, 123 display unit, 130 Video camera, 131 main body, 132 lens, 133 start / stop switch, 134 display, 140 mobile phone, 141 display, 150 tablet computer, 151 display

Claims (11)

In the cyclic olefin resin composition film containing the cyclic olefin resin and the styrene elastomer,
The average value of the short axis dispersion diameter of the styrene-based elastomer is 2.0 μm or less,
The tear strength of the cyclic olefin resin composition film in the major axis direction of the styrene elastomer is 70 N / mm or less, and the tear strength of the cyclic olefin resin composition film in the minor axis direction of the styrene elastomer is The cyclic olefin resin composition film which is 90 N / mm or more. The tear strength of the cyclic olefin-based resin composition film in the major axis direction of the styrene-based elastomer is 40 N / mm or more,
The difference between the tear strength of the cyclic olefin resin composition film in the major axis direction of the styrene elastomer and the tear strength of the cyclic olefin resin composition film in the minor axis direction of the styrene elastomer is 40 N / mm. The cyclic olefin-based resin composition film according to claim 1, which is as described above.   The cyclic olefin resin composition film according to claim 1 or 2, wherein the addition amount of the styrene elastomer is 5 wt% or more and 30 wt% or less.   The cyclic olefin resin composition film according to any one of claims 1 to 3, wherein retardation in an in-plane direction is 30 nm or less.   The cyclic olefin resin composition film according to any one of claims 1 to 4, wherein the cyclic olefin resin is an addition copolymer of ethylene and norbornene.   The styrene elastomer is at least one selected from the group consisting of styrene / ethylene / butylene / styrene block copolymers, styrene / ethylene / propylene / styrene block copolymers, and hydrogenated styrene / butadiene block copolymers. The cyclic olefin resin composition film according to any one of claims 1 to 5.   A transparent conductive element comprising the cyclic olefin-based resin composition film according to claim 1 as a base material.   An input device comprising the cyclic olefin-based resin composition film according to any one of claims 1 to 6.   A display device comprising the cyclic olefin-based resin composition film according to any one of claims 1 to 6.   An electronic device comprising the cyclic olefin-based resin composition film according to any one of claims 1 to 6. Cyclic olefin resin and styrene elastomer are heated and melted,
The heated and melted cyclic olefin resin composition is extruded into a film by an extrusion method, the average value of the short axis dispersion diameter of the styrene elastomer is 2.0 μm or less, and the long axis direction of the styrene elastomer The cyclic olefin resin composition film has a tear strength of 70 N / mm or less, and the cyclic olefin resin composition film has a tear strength of 90 N / mm or more in the minor axis direction of the styrene elastomer. The manufacturing method of the cyclic olefin resin composition film which obtains an olefin resin composition film.

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